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Definition of atom:

  1. A constituent particle of matter, or a molecule supposed to be made up of subordinate particles.
  2. An ultimate indivisible particle of matter.
  3. An ultimate particle of matter not necessarily indivisible; a molecule.
  4. Anything extremely small; a particle; a whit.
  5. The smallest particle of matter that can enter into combination; one of the elementary constituents of a molecule.
  6. To reduce to atoms.


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